Shrug---If you are using any kind of hardware store paint which does not use a hardner, then do not try to rub it out. That will destroy your paint job. The only paints which can be (or need to be) rubbed out are paints which have a hardner added to them. Enamel paints, (even catalyzed acrylic enamel paints with a hardner) are formulated to give a high gloss "as sprayed". Trying to rub out an enamel paint is similar to trying to polish a block of cheese---the substrate is simply not hard enough to ever polish. Instead it will go to a uniform dullness, that can not be repaired. Use the paint reducing (thinning) agent that the paint supplier recommends, and for your first experiments with spray painting, don't even think about using a high priced automotive paint from a body shop supplier. Do use a charcoal filter style respirator. Painting in an enclosed space with plastic drop sheets creates its own unique hazards---fire, explosion, or even suffocation through oxygen deprivation. A fan exhausting paint fumes from the room is simply another source of electrical spark to ignite this highly combustible vapour. I strongly suggest that for your first spray-painting experience that you either do it in the garage with the garage door fully open for air circulation, or do it outside (not in direct sunlight---and not when the temperature is over 80 degrees F) I am sure that your new syphon feed gun will have instructions on how to adjust it for the correct spray pattern. Thin the paint according to the manufacturers instructions and filter it just before you pour it into the gun cup. Spray at 40 to 45 PSI. The actual spray painting itself is reasonably simple. Always keep the gun moving. If you stop in any spot, you will instantly have a run. Keep the gun at a uniform distance from your car (about 12" to 15" as you spray). (any closer, you will get runs---any farther away and you will get "dry spots" that won't shine) Do not make short jerky movemnts, instead try and use long sweeping arm movements---but remember that even though you move your arm through an arc, you must keep the gun at a constant distance from your work (that is far easier said than done).---You will be amazed and impressed with what you are able to do. Do NOT try and apply too much paint at once. Your first time around the car, you may only barely see the colour you have sprayed on. Thats O.K.--let the paint flash off (dry) for about 20 minutes, then apply the second coat. The first coat will act as a "binder" to hold the second coat in place, so that it is less apt to run or sag. Wait 20 minutes and then apply the third coat.---that should be sufficient to get good "colour" on the car.